spi: Use device_find_any_child() instead of custom approach

We have already a helper to get the first child device, use it and
drop custom approach.

Reviewed-by: Rafael J. Wysocki <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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